Method for treating wastewater from dairy processing

Abstract

The invention belongs to the field of wastewater treatment and particularly relates to a method for treating wastewater from dairy processing, comprising the following steps: (1) discharging the wastewater into a hydrolyzing adjusting pool through a machinery grille to be subjected to hydrolysis and acidification; (2) making the wastewater subjected to hydrolysis and acidification in the hydrolyzing adjusting pool enter an UASB (upflow anaerobic sludge bed) through an oil removing settling pond and a clear water pool to be subjected to anaerobic treatment; and (3) making the wastewater treated in the UASB reactor enter an SBR (sequencing batch reactor) to be subjected to aerobic treatment. The water from the hydrolyzing adjusting pool is more beneficial for anaerobic bacteria to ferment and gasify and play a role so that the yield of biogas increases gradually, the saving of power consumed by the subsequent aerobic process is considerable, the COD (chemical oxygen demand) of the water is low, and the problem on the subsequent treatment of a large number of scrum can be solved. The yield of the aerobic sludge decreases by 30%-50%, and the sludge dewatering and external transporting expenses are saved.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular, the invention relates to a treatment method for dairy processing wastewater. Background technique [0002] UASB method, that is, anaerobic biological treatment method, refers to the process of decomposing and converting various complex organic matters in wastewater into methane and carbon dioxide through the action of anaerobic microorganisms (including facultative microorganisms) under the condition of no molecular oxygen. . Also known as anaerobic digestion. The main objects of treatment are: (1) high-concentration organic wastewater; (2) sludge treatment; (3) treatment of biologically refractory organic wastewater; (4) biological denitrification and phosphorus removal. [0003] The UASB method has a large load capacity and is suitable for the treatment of high-concentration organic wastewater. A well-run UASB has a high removal rate of organic pollutants, does not require ...

AI Technical Summary

Problems solved by technology

When the water quality inside the regulating tank is not completely homogeneous and acid-base neutralized, it is not conducive to the normal reproduction of hydrolytic microorganisms and bacteria, and at the same time, the biomass cannot meet the biomass requirements of the hydrolysis regulating tank process.

The annual average COD concentration of production water is about 3500mg / L, which has exceeded the load range of subsequent anaerobic, aerobic, and biological strain treatments. In order to maintain the stable operation of the entire wastewater treatment process, the wastewater treatment process first disables hydrolysis The mixing equipment in the regulating tank promotes the homogeneous acidification and flocculation of the excess organic matter in the wastewater under the condition of a hydraulic retention time of 8-10 hours in the hydrolysis regulating tank, which leads to the milk scale naturally formed in the wastewater under the catalysis of lactic acid bacteria cannot be removed in time Decompose in the ground, suspend the water surface in the form of colloidal solids to form scum, accumulate over time to form a thick "slag cover", which not only affects the tank capacity, but also is not conducive to the efficient operation of the subsequent anaerobic process, increases the cost of wastewater treatment, and the effluent cannot meet the standard emission

[0010] In the prior art, a large amount of scum produced by dairy wastewater is scraped out of the adjustment tank by a mud scraper for other treatment. However, due to the excessive scum content, the scraper shaft of the mud scraper is easily bent and deformed, and a large amount of scum is very important for other It is very difficult to deal with, and even cannot be disposed of but can only be discarded, causing great environmental risks

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